a person who supports or believes in the ideas of Karl Barth
Barthian in American English
(ˈbɑːrtiən, -θi-)
adjective
1.
of or pertaining to Karl Barth or his theology
noun
2.
a supporter or adherent of Karl Barth or his theology
Word origin
[1925–30; barth + -ian]This word is first recorded in the period 1925–30. Other words that entered Englishat around the same time include: chain reaction, decibel, recycle, reflex camera, turnaround-ian is a suffix occurring originally in adjectives borrowed from Latin, formed from nounsdenoting places (Italian) or persons (Flavian), and now productively forming English adjectives by extension of the Latin pattern.Attached to geographical names, it denotes provenance or membership (Washingtonian), the latter sense now extended to membership in social classes, religious denominations,etc. (Episcopalian; pedestrian). Attached to personal names, it has the additional senses “contemporary with” ( Victorian) or “proponent of” (Hegelian; Freudian) the person specified by the noun base. It also occurs in a set of personal nouns,mainly loanwords from French, denoting one who engages in, practices, or works withthe referent of the base noun (comedian; grammarian; theologian)